On 6-quart Instant Pot™, select SAUTE; adjust to normal. Heat oil in insert.
Add onions, bell peppers, herbes de provence and salt; cook 12 to 14 minutes, stirring occasionally, until softened.
Stir in zucchini, eggplant and garlic. Select CANCEL.
Stir in tomatoes and broth, then pasta. Secure lid; set pressure valve to SEALING. Select MANUAL; cook on high pressure 7 minutes.
Select CANCEL. Set pressure valve to VENTING to quick-release pressure.
Immediately stir mixture 1 to 2 minutes or until pasta is completely separated. Pasta will appear to be stuck together but will separate while stirring.